I love D1 stage . And implementet at least with 4 dacs . Will need to modify the biasing network a bit if the dc point of the dac is different from 0 volt . An example is the Philips tda 1545 wich requires 3.3 volts as dc working point.
Currently I am using the lovoltech j fet in that circuit . I am very happy .

I´m currently building my D1 stage with different options.
I´m still no really lucky. my CDP (shanling CD-S100MK2) has a PCM1738 inside. This chip seems to work best into a "virtual" ground, the common Voltage is set to 2,50V.
See this picture, and thread: http://www.diyaudio.com/forums/attac...amp=1081271528D1 output stage and PCM1738
I tried already a few different adjustments and I thought it were good, but after long listening I´m sure, I´m missing dynamic.
Would you please posting your lovoltech D1? I´m working at a 2SK389 based D1, very different to original. I thought too about LU1014d, but those needs a lot of current to operate in "triode region"
Best Regards
Adam

No, really also in a single ended set up I like dynamics , very correct . But compressions and dynamics depends on power supplies implementation and a number of other things.
With j fet (lovoltech)there is a step forward by my point of view ,and often I can see the mixing consolle very clearly . It is a nice sensation .
I wasnt so happy with 2sk s .
Absolutely the lovoltech require matching between channels . The difference is quite audible and not at all subtle.

I started by inserting jfets in the same circuit , just adjusting the bias ... and all seems to work pretty well .

Originally posted by stefanobilliani No, really also in a single ended set up I like dynamics , very correct . But compressions and dynamics depends on power supplies implementation and a number of other things.
With j fet (lovoltech)there is a step forward by my point of view ,and often I can see the mixing consolle very clearly . It is a nice sensation .
I wasnt so happy with 2sk s .
Absolutely the lovoltech require matching between channels . The difference is quite audible and not at all subtle.

I started by inserting jfets in the same circuit , just adjusting the bias ... and all seems to work pretty well .

hehehe I have the Philips tda15145 but every part of the circuitry has separated supplies , laser motors drivers and clock included .
I can assure you that it works very very good .
I had also nice performances with sony current pulse , in that case in a balanced configuration .
The philips is 16 bit converter , sony is tipically 1 bit.

Originally posted by stefanobilliani I love D1 stage . And implementet at least with 4 dacs . Will need to modify the biasing network a bit if the dc point of the dac is different from 0 volt . An example is the Philips tda 1545 wich requires 3.3 volts as dc working point.
Currently I am using the lovoltech j fet in that circuit . I am very happy .

Assuming that I have 0 volt out from the DAC, what do I have to change to the circuit to use Lovoltech Jfet instead of IRF610. My thinking is that I need to change the two 1.5K resistors to a different value to bias the Jfet? The schematic that I am looking at is attached.

Assuming that I have 0 volt out from the DAC, what do I have to change to the circuit to use Lovoltech Jfet instead of IRF610. My thinking is that I need to change the two 1.5K resistors to a different value to bias the Jfet? The schematic that I am looking at is attached.

JFET Vgs is negative, unlike MOSFET, so instead of tying r5a to +30 tie it to -30. The 1.5K resistors control gain, not bias, to change current bias change the 3.3K resistor.